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2x=21-3y
x=21-3y/2
3x-y=4
3(21-3y/2)-y=4
63-9y/2-y=4
63-9y-2y/2=4
63-9y-2y=4*2
63-11y=8
-11y=8-63
-11y=-55
y=-55/-11
y=5
2x+3y=21
2x+3(5)=21
2x+15=21
2x=21-15
2x=6
x=6/2
x=3
S=(3,5)